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Sökning: WFRF:(Karlberg L.) > Kungliga Tekniska Högskolan

  • Resultat 1-4 av 4
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1.
  • Ben-Gal, A., et al. (författare)
  • Temporal robustness of linear relationships between production and transpiration
  • 2003
  • Ingår i: Plant and Soil. - 0032-079X .- 1573-5036. ; 251:2, s. 211-218
  • Tidskriftsartikel (refereegranskat)abstract
    • Seasonal dependence of biomass production on transpiration has been previously reported for a number of crops under salinity and drought. Linear yield (Y) to transpiration ( T) relationships have been utilized in plant-growth and water-uptake models to estimate yield based on predicted transpiration values. The relationship is often employed for time steps that are very small compared with the whole season measurements, even though no empirical validation exists for such application. This work tests the hypothesis that linear Y-T relationships are valid throughout the life span of crops under varied natural conditions and levels of environmental stress. Effects of salinity and water supply on growth, water use and yields of tomatoes ( Lycopersicon esculentum Mill.) were studied for two distinct conditions of potential transpiration. Linear relationships between relative Y and relative ET were found to be consistent throughout the life span of the crops for both growing seasons. Water-use efficiency increased together with plant growth as a result of changes in the plant's surface area to volume ratio. This empirical validation of linear Y-T relationships for short time periods is beneficial in confirming their usefulness in growth and water uptake models.
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2.
  • Klemedtsson, Leif, 1953, et al. (författare)
  • Bayesian calibration method used to elucidate carbon turnover in forest on drained organic soil
  • 2008
  • Ingår i: Biogeochemistry. - : Springer Science and Business Media LLC. - 0168-2563 .- 1573-515X. ; 89:1, s. 61-79
  • Tidskriftsartikel (refereegranskat)abstract
    • Depending on the balance between sink and source processes for C, drained organic forest soil ecosystems can be in balance or act as net sinks or sources of CO2 to the atmosphere. In order to study the effect of groundwater level and soil temperature on C-flux, the CoupModel was calibrated (climate data, groundwater levels, soil CO2 flux, net ecosystem fluxes of CO2-exchange, sensible heat flux and latent heat flux, forest production etc.) for a drained forest in Sweden. Bayesian calibration techniques were used to elucidate how different parameters and variables were interlinked in C-circulation. The calibrated model reproduced abiotic and biotic variables reasonably well except for root respiration, which was largely underestimated. Bayesian calibration reduced the uncertainties in the model and highlighted the fact that calibrations should be performed with a high number of parameters instead of specific parameter values.
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4.
  • Rockström, Johan, et al. (författare)
  • A safe operating space for humanity
  • 2013
  • Ingår i: The Future of Nature. - : Yale University Press. - 9780300184617 ; , s. 491-501
  • Bokkapitel (refereegranskat)
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  • Resultat 1-4 av 4

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